Could somebody help me with a Chemistry question?
1) The temperature is decreased.
2) More reactants are added to the reaction vessel while the volume is kept constant.
3) The pressure is increased.
4) The stirrer for a reaction is turned off.
5) A catalyst is added to the reaction solution.
Answer:
3.
No effect when you increase pressure of SOLUTION.
1 and 4 will decrease reaction rate while 2 and 5 increase.
All of the above
Added ...
Oops, didn't read the question properly. Which ones will have NO effect?
NONE of the above.
(2) All the others would have some effect on a chemical reaction rate depending of the reaction. (1,4) would slow the reaction in general although there are reactions where this would not be true. (3,5) would increase the reaction rate.
If the temperature is decreased, the reaction rate should decrease, because you would have fewer collisions.
If you add more reactants, it should probably increase the rate (unless it's a reaction that obeys zero-order kinetics)
If the pressure is increased, this might affect gases, but it should not affect aqueous solution chemistry.
If the stirring stops, then the rate may slow doen a bit (fewer effective collisions)
If a catalyst is added the rate should increase.
The only change that would have NO EFFECT on the rate would be (3)
The effect of pressure on a liquid phase reaction is negligible
The rate of reaction is dependant on the concentration of the reactants, the temperature and whether a catalyst is present. Given this, I would surmise that #3 will have no effect on the reaction rate. #4 is an interesting answer. Stirring has an effect on reaction rate, but is generally negligible when compared to the effect of the other 3. It is really only noticeable in a "fast" reaction. But go with #3, it is your sure bet.
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